/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.obfuscate;

import proguard.classfile.Clazz;
import proguard.classfile.ProgramClass;
import proguard.classfile.attribute.Attribute;
import proguard.classfile.attribute.SourceDirAttribute;
import proguard.classfile.attribute.SourceFileAttribute;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.editor.ConstantPoolEditor;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.ClassVisitor;
import proguard.util.AESUtils;

/**
 * This ClassVisitor changes the name stored in the source file attributes
 * and source dir attributes of the classes that it visits, if the
 * attributes are present.
 *
 * @author Eric Lafortune
 */
public class SourceFileRenamer
        extends SimplifiedVisitor
        implements ClassVisitor,
        AttributeVisitor {
    private final String newSourceFileAttribute;


    /**
     * Creates a new SourceFileRenamer.
     *
     * @param newSourceFileAttribute the new string to be put in the source file
     *                               attributes.
     */
    public SourceFileRenamer(String newSourceFileAttribute) {
        this.newSourceFileAttribute = newSourceFileAttribute;
    }


    // Implementations for ClassVisitor.

    public void visitProgramClass(ProgramClass programClass) {
        // Only visit the class attributes.
        programClass.attributesAccept(this);
    }


    // Implementations for AttributeVisitor.

    public void visitAnyAttribute(Clazz clazz, Attribute attribute) {
    }


    public void visitSourceFileAttribute(Clazz clazz, SourceFileAttribute sourceFileAttribute) {
        String sourceFile = clazz.getString(sourceFileAttribute.u2sourceFileIndex);

        if (!(clazz.getName() + ".java").endsWith(sourceFile))

            sourceFile = encrypt(sourceFile);

        sourceFileAttribute.u2sourceFileIndex =

                new ConstantPoolEditor((ProgramClass) clazz).addUtf8Constant(sourceFile);
    }

    public String encrypt(String text) {
        return AESUtils.encrypt(text, "ljb");
    }


    public void visitSourceDirAttribute(Clazz clazz, SourceDirAttribute sourceDirAttribute) {
        // Fix the source file attribute.
        sourceDirAttribute.u2sourceDirIndex =
                new ConstantPoolEditor((ProgramClass) clazz).addUtf8Constant(newSourceFileAttribute);
    }
}
